def test_is_null(solver):
# creating empty (null) objects.
dtypeSpec = DatatypeDecl(solver)
cons = DatatypeConstructorDecl(solver)
d = Datatype(solver)
consConstr = DatatypeConstructor(solver)
sel = DatatypeSelector(solver)
# verifying that the objects are considered null.
assert dtypeSpec.isNull()
assert cons.isNull()
assert d.isNull()
assert consConstr.isNull()
assert sel.isNull()
# changing the objects to be non-null
dtypeSpec = solver.mkDatatypeDecl("list")
cons = solver.mkDatatypeConstructorDecl("cons")
cons.addSelector("head", solver.getIntegerSort())
dtypeSpec.addConstructor(cons)
assert dtypeSpec.getNumConstructors() == 1
assert not dtypeSpec.isParametric()
listSort = solver.mkDatatypeSort(dtypeSpec)
d = listSort.getDatatype()
consConstr = d[0]
sel = consConstr[0]
# verifying that the new objects are non-null
assert not dtypeSpec.isNull()
assert not cons.isNull()
assert not d.isNull()
assert not consConstr.isNull()
assert not sel.isNull()
def test_datatype_names(solver):
intSort = solver.getIntegerSort()
# create datatype sort to test
dtypeSpec = solver.mkDatatypeDecl("list")
dtypeSpec.getName()
assert dtypeSpec.getName() == "list"
cons = solver.mkDatatypeConstructorDecl("cons")
cons.addSelector("head", intSort)
cons.addSelectorSelf("tail")
dtypeSpec.addConstructor(cons)
nil = solver.mkDatatypeConstructorDecl("nil")
dtypeSpec.addConstructor(nil)
dtypeSort = solver.mkDatatypeSort(dtypeSpec)
dt = dtypeSort.getDatatype()
assert dt.getName() == "list"
dt.getConstructor("nil")
dt["cons"]
with pytest.raises(RuntimeError):
dt.getConstructor("head")
with pytest.raises(RuntimeError):
dt.getConstructor("")
dcons = dt[0]
assert dcons.getName() == "cons"
dcons.getSelector("head")
dcons["tail"]
with pytest.raises(RuntimeError):
dcons.getSelector("cons")
# get selector
dselTail = dcons[1]
assert dselTail.getName() == "tail"
assert dselTail.getCodomainSort() == dtypeSort
# get selector from datatype
dt.getSelector("head")
with pytest.raises(RuntimeError):
dt.getSelector("cons")
# possible to construct null datatype declarations if not using mkDatatypeDecl
with pytest.raises(RuntimeError):
DatatypeDecl(solver).getName()